Remove sandbox on Windows.

build/gn_migration.gypi

Index: build/gn_migration.gypi
diff --git a/build/gn_migration.gypi b/build/gn_migration.gypi
index 00fc23f0d7239cba256e2f98396410f02e901c4c..ce095d7fd1138e93b9820922fdc37439e694b15b 100644
--- a/build/gn_migration.gypi
+++ b/build/gn_migration.gypi
@@ -498,17 +498,10 @@
             '../chrome/chrome.gyp:setup',
             '../chrome/chrome.gyp:setup_unittests',
             '../chrome/installer/mini_installer.gyp:mini_installer',
-            '../chrome_elf/chrome_elf.gyp:chrome_elf_unittests',
-            '../chrome_elf/chrome_elf.gyp:dll_hash_main',
             '../components/components.gyp:wifi_test',
             '../net/net.gyp:quic_client',
             '../net/net.gyp:quic_server',
             '../rlz/rlz.gyp:rlz',
-            '../sandbox/sandbox.gyp:pocdll',
-            '../sandbox/sandbox.gyp:sandbox_poc',
-            '../sandbox/sandbox.gyp:sbox_integration_tests',
-            '../sandbox/sandbox.gyp:sbox_unittests',
-            '../sandbox/sandbox.gyp:sbox_validation_tests',
             '../testing/gtest.gyp:gtest_main',
             '../third_party/codesighs/codesighs.gyp:msdump2symdb',
             '../third_party/codesighs/codesighs.gyp:msmap2tsv',
@@ -599,10 +592,6 @@
               'dependencies': [
                 '../chrome/chrome.gyp:installer_util_unittests_run',
                 '../chrome/chrome.gyp:setup_unittests_run',
-                '../chrome_elf/chrome_elf.gyp:chrome_elf_unittests_run',
-                '../sandbox/sandbox.gyp:sbox_integration_tests_run',
-                '../sandbox/sandbox.gyp:sbox_unittests_run',
-                '../sandbox/sandbox.gyp:sbox_validation_tests_run',
               ],
             }],
             ['OS!="android"', {
@@ -744,7 +733,6 @@
             '../courgette/courgette.gyp:courgette64',
             '../crypto/crypto.gyp:crypto_nacl_win64',
             '../ipc/ipc.gyp:ipc_win64',
-            '../sandbox/sandbox.gyp:sandbox_win64',
           ],
         }],
         ['OS=="win" and target_arch=="ia32" and configuration_policy==1', {